Thank you for visiting our ebay store! Worlds's Loudest Whistle SPL up to 142dB 8x louder than a common whistle 2 mile usable range Anti-microbial composite, all-weather construction Unique radial tri-frequency design Naturally Buoyant Works in all weather environments, including underwater Patented Design US8925478 - LOUD! - Up to 142dB for 2+ mile range - Lightweight Design with Omni Directional Output - Used for Boating, Sporting Events, Life Safety - Works in all weather environments, including underwaterHyperWhistle The Original Worlds Loudest Whistle up to 142db Loud, Very Long ...